IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 294-199242 event on 2024 Sep 19, 11:47 UT Visible from Summary ------- On 2024 Sep 19 UT, the 113.022 km diameter asteroid (42) Isis will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.41 mag to 11.12 mag (the magnitude of the asteroid) for at most 8.000 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2024 Sep 19, 11:40 - 2024 Sep 19, 11:55 * geocentric midpoint of event [JD]: 2460572.99160942 * magnitude of target star: 11.98 * magnitude drop [mag]: 0.41 * estimated maximum duration [s]: 8.000 * Moon: 97 % sunlit, 98° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 120 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 14.1330 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 294-199242 by 42 Isis on 2024 Sep 19 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 4 0 0 -19 39 14 11 40 48.8 0 123 69 -20 18 26 .. .. .. -20 23 6 .. .. .. .... 5 0 0 -20 16 42 11 40 49.0 1 123 69 -20 55 55 -19 37 40 -21 0 36 -19 33 3 0.36 6 0 0 -20 54 6 11 40 49.3 3 123 68 -21 33 21 -20 15 3 -21 38 2 -20 10 25 0.36 7 0 0 -21 31 26 11 40 49.9 4 122 67 -22 10 42 -20 52 22 -22 15 23 -20 47 43 0.36 8 0 0 -22 8 39 11 40 50.6 5 122 66 -22 47 56 -21 29 34 -22 52 37 -21 24 56 0.36 9 0 0 -22 45 46 11 40 51.4 6 121 65 -23 25 3 -22 6 40 -23 29 44 -22 2 2 0.36 10 0 0 -23 22 44 11 40 52.5 7 121 65 -24 2 1 -22 43 38 -24 6 42 -22 39 0 0.36 11 0 0 -23 59 32 11 40 53.7 8 121 64 -24 38 49 -23 20 26 -24 43 30 -23 15 48 0.36 12 0 0 -24 36 9 11 40 55.1 9 120 63 -25 15 26 -23 57 4 -25 20 7 -23 52 26 0.36 13 0 0 -25 12 35 11 40 56.7 10 120 62 -25 51 50 -24 33 30 -25 56 31 -24 28 52 0.36 14 0 0 -25 48 47 11 40 58.4 11 119 61 -26 28 1 -25 9 44 -26 32 42 -25 5 5 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54 11 54 40.8 17 242 -68 -23 9 15 -21 50 43 -23 13 57 -21 46 4 0.39 -173 0 0 -21 52 27 11 54 43.5 16 242 -68 -22 31 48 -21 13 17 -22 36 30 -21 8 39 0.39 -172 0 0 -21 14 54 11 54 45.9 14 242 -68 -21 54 14 -20 35 45 -21 58 56 -20 31 6 0.39 -171 0 0 -20 37 15 11 54 48.2 13 241 -69 -21 16 34 -19 58 7 -21 21 16 -19 53 29 0.39 -170 0 0 -19 59 32 11 54 50.3 12 241 -69 -20 38 49 -19 20 26 -20 43 31 -19 15 47 0.40 -169 0 0 -19 21 46 11 54 52.2 11 241 -69 -20 1 1 -18 42 42 -20 5 42 -18 38 3 0.40 -168 0 0 -18 43 58 11 54 53.9 10 240 -69 -19 23 11 -18 4 56 -19 27 52 -18 0 18 0.41 -167 0 0 -18 6 10 11 54 55.5 9 240 -69 -18 45 21 -17 27 11 -18 50 1 -17 22 33 0.41 -166 0 0 -17 28 23 11 54 56.9 8 240 -68 -18 7 31 -16 49 27 -18 12 11 -16 44 50 0.42 -165 0 0 -16 50 39 11 54 58.0 6 239 -68 -17 29 43 -16 11 46 -17 34 23 -16 7 9 0.43 -164 0 0 -16 12 58 11 54 59.0 5 239 -68 -16 51 59 -15 34 8 -16 56 38 -15 29 32 0.44 -163 0 0 -15 35 22 11 54 59.8 4 239 -68 -16 14 19 -14 56 36 -16 18 58 -14 52 0 0.46 -162 0 0 -14 57 53 11 55 0.4 3 238 -67 -15 36 46 -14 19 11 -15 41 24 -14 14 35 0.50 -161 0 0 -14 20 31 11 55 0.9 2 238 -67 -14 59 19 -13 41 53 -15 3 57 -13 37 18 0.58 -160 0 0 -13 43 17 11 55 1.1 1 238 -66 -14 22 1 -13 4 44 -14 26 39 -13 0 10 0.91 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 294-199242 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 38 40.4832 DE: -31 16 05.760 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 38 40.4830 DE: -31 16 05.761 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42) Isis asteroid class: Barbarian approx. diameter [km]: 113 approx. diameter ["]: 0.109 distance from Earth [AU]: 1.43310 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.029", 0.001", 99.096° remarks: * orbital elements for (42)Isis : Mean anomaly = 352.8321069643 deg Arg. of pericenter = 237.2545552481 deg Long. of node = 84.1660121979 deg Inclination = 8.5112320337 deg Eccentricity = 0.2219996079 Semimajor axis = 2.4426078780 AU Perihelion dist = 1.9003498868 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60572.49160888 TDT (2024 Sep 19.4916) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,8.00,2024,9,19,11.798626,0.020958,-0.327561,7.961068,0.504511,0.004934,0.000493,0.000000,0.000000 104.2129,-31.2481,1.42,1.18,False UCAC4 294-199242,18.64457870,-31.2682667,12.29,11.98,11.81,0.0,0,,18.67123557,-31.2480923,0.41,0.33,0,0,0 42,Isis,11.12,113.022,1.4331,0,0,3.810,3.10,,6.0,0 0,352.7052,2024,9,19,237.2546,84.1660,8.5112,0.22200,2.44261,1.90035,7.61,5.0,0.15 1.060,0.0287,0.0015,99,0.0065,Known errors,1.98,0,-1,-1 20240919_199242,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org